Noun
English Wikipedia has an article on:isobutanolWikipedia
isobutanol (uncountable)
(organic chemistry) The aliphatic alcohol 2-methyl-1-propanol that is used as a solvent and in organic synthesis
The branched isomer with the alcohol at a terminal carbon is isobutanol or 2-methyl-1-propanol, and the branched isomer with the alcohol at the internal carbon is tert-butanol or 2-methyl-2-propanol. Source: Internet
First the amount of isoamyl alcohol and isobutanol is the yeast strain. Source: Internet